<template>
  <div>
    <div class="component-upload-image" >
      <el-upload
        :action="uploadImgUrl"
        :before-upload="handleBeforeUpload"
        :file-list.sync="fileListData"
        :limit="limit"
        :on-error="handleUploadError"
        :on-exceed="handleExceed"
        :on-success="handleUploadSuccess"
        :show-file-list="true"
        :headers="headers"
        :class="{ hide: this.fileList.length >= this.limit,small:uploadtype == 'btn'}"
        list-type="picture-card"
        name="file"
        :on-remove="handleRemove"
        :on-preview="handlePictureCardPreview"
        ref="upload"
      >
        <i class="el-icon-plus"></i>
      </el-upload>

      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize">
          小于<b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
      </div>

      <el-dialog
        :visible.sync="dialogVisible"
        title="预览"
        width="800"
        append-to-body
      >
        <img
          :src="dialogImageUrl"
          style="display: block; max-width: 100%; margin: 0 auto"
        />
      </el-dialog>
    </div>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  props: {
    uploadtype: {
      type: String,
      default: "image",
    },
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 1,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    fileList: {
      type: [Array, Object, String],
      default: [],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/file/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileListData: [],
      listText: [""],
    };
  },
  watch: {
    filelist: {
      handler(newValue) {
        if (newValue) {
          this.fileListData = newValue;
        }
      },
      deep: true,
      immediate: true,
    },
  },
  created() {
    this.fileListData = this.fileList;
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    choosefile() {
      this.$refs["upload"].$refs["upload-inner"].handleClick();
    },
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileListData.map((f) => f.name).indexOf(file.name);
      this.fileListData.splice(findex, 1);
      this.$emit("update:fileList", this.fileListData);
    },
    clearfile(file) {
      const findex = this.fileListData.map((f) => f.name).indexOf(file.name);
      this.fileListData.splice(findex, 1);
      this.$emit("update:fileList", this.fileListData);
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      this.fileListData.push({ name: res.data.name, url: res.data.url });
      this.$emit("update:fileList", this.fileListData);
      this.loading.close();
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$message.error(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.loading = this.$loading({
        lock: true,
        text: "上传中",
        background: "rgba(0, 0, 0, 0.7)",
      });
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
::v-deep.small .el-upload-list__item{
  width: 100px;
  height: 50px;
}
::v-deep.small .el-upload--picture-card{
  width: 100px;
  height: 50px;
  line-height: 60px;
  animation: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
